Mining-machine



(No Model.) 4 Sheets-Sheet 1.

E. A. SPERRY. MINING MACHINE.

No. 454,500. Patented June 23,1891.

(No Model.) 4 Sheets-Sheet 2.

E. A. SPERRY.

MINING MACHINE.

No. 454,500. Patented June 23,1891.

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(No Model.) 4 Sheets-Sheet 3.

E. A. SPERRY.

MINING MAUHINE.

No. 454,500. Patented June 23,1891.

jive/c5911 EQAMLLdcL, $W.

4 Sheets-Sheet 4. E A. SPERRY. MINING MACHINE.

N0. 454 500. Patented June 23,1891.

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ELMER A. SPERRY, OF CHICAGO, ILLINOIS.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 454,500, dated June 23, 1891. Application filed July 11, 1890. Serial No. 358,401. (No model.)

To aZZ whom zit may concern.-

Be it known that I, ELMER A. SPERRY, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Mining-Machines, of which the following is a specification.

My invention relates to mining-machines, and has for its object to provide convenient means for digging coal and the like by means of an electric motor.

Figure l is a side view of the machine; Fig. 2, a plan view; Fig. 3, a vertical longitudinal section; Fig. 4, a detail of the pick; Fig. 5, a detail of the carbon-holder. Fig. 6 is a detail of the fly-wheel. Fig. 7 is a detail of the gear-wheel, Figs. 8 and 9, modifications of the clutching mechanism; Fig. 10, a modified pitman; Fig. 11; an additional modified pitman.

A is one side of the machine, preferably made of a single casting, having the trunnion A, on which is journaled the wheel A and the j ourn al-box A on which the internal gear is journaled, and the journal-box A for the short shaft To this piece A is secured the handle B, and this portion is secured to the opposite portion of the frame, which is preferably made of a single piece, and which may be indicated by the letter B. The two are bolted together by the bolts B B The portion B is provided with the trunnion B on which is journaled the wheel 13, and to it is secured the electric motor consisting of the field-magnet B pole-pieces B, armature 13', commutator B and switch B". Upon the pole-piece is secured the handle B and the cap B for the exterior of the armature.

O is a shaft transverse of the f ram e, carrying the armature at one end and the fly-wheel C at the other and journaled at C on the framepiece B. This shaft also carries the pinion C which meshes with the gear C on the shaft A This shaft also carries the pinion C which meshes with the large spur-wheel C", which has a baekwardly-extending perforated journal C", which is received into the box A A portion of the casting A serves as a casing for this gear 0. The frame B extends forwardly, as indicated, so as to form a suitable guide for the operative parts of the machine. Journaled within the perforated journal 0 is one end of the crank D, the other end of which is journaled upon the frame or in the fieldmagnet, and the horizontal portion of which is provided with the sleeve or pulley D, j ournaled by means of the balls D About this sleeve or pulley lies the pitman-strap E, se cured by the cap E on the slide E the lateral extensions E E of which rest upon the top of the extended portion of the frame B and beneath the guide-bars E E which are bolted to such frame. Secured to the slide E by the key F is the reciprocating bar F, which passes through the extremity F of such proj ecting frame 13. Between this extremity and the slide E is disposed the packing or elastic cushion F and within the outer cylindrical portion of such end is the tube F within which lies the spiral spring F about the bar F. At the other extremity of the tube F is the slide F against which bears the other end of the spiral spring F".

G is the pick-point secured by the key G to the end of the tube G the other end of which is secured by the key G to the end of the rod F. The slide F engages the inner end of the tube G This tube has the transverse slot G*, for a purpose hereinafter set forth.

J is a curved spring lying upon and within the gear-wheel C and having the hook J at one end and rigidly secured at the other to the pin J 2 upon the gear. The spring J is so disposed as that its hook J will engage the lug J which projects from the crank D inwardly toward the gear C The operation of this part of the device is substantially as follows: The operator by means of the handles B and B directs the machine so as to bring the pick to the point of work. By controlling the switch B he operates the electric motor at will, the same being suitably connected with a source of electrical energy. This drives the shaft C,'and hence, by the interineshing gears and pinions, the gear C iu the direction indicated by the arrow. It is in Fig. 8 assumed that the spring F is extended; but-as soon as the rotation brings the hook J into engagement with the pin J the crank, which is freely j on rnaled at both ends, will be carried about by means of such spring J toward the position indicated in dotted lines in Fig. 3, thus re- IOO tracting the slide E and compressing the spring F As soon as the parts reach the position indicated in dotted lines the expansion of the spring F will cause the crank to leave the hook, as indicated,and the pick-point will be hurled against the work. As soon as its blow is delivered its progress will be stopped by reason of the fact that the pitman E is flexible or elastic, and almost immediately it will be caught up again by the further revolution of the gear 0. The cushion F is to prevent the shock on the machine, as is also the elastic spring J.

Referring now to the details, the fly-wheel C is composed of the exterior solid portion and the interior part K, which is keyed upon the shaft 0 and has the projecting ends K K. Between these ends and the inner projections K K are disposed the elastic cushions K K to make the connections between the shaft and the heavy portion of the flywheel elastic. In like manner the connection between the working portion of the gearwheel 0 and its shaft A is made by means of the springs L L and the ledges L L and the parts L L which are keyed upon the shaft A Itis obvious that either of these devices or similar devices could be employed for elastically connecting any wheel with its respective shaft. These elastic connections are exccedinglyimportant in amachine of this character. The flexible belt E may also be replaced with the metallic flexible belt or pitman M or with the jointed pitman N, the two portions of which are pivoted together and suitably connected to the sleeve or pulley D and by the short shaft 0 to the slide E Beneath these pivoted parts is the upwardlybearing spring S, secured upon the bottom of the frame B, so that when the blow is delivered the portions of the jointed pitman will be thrown upward, as indicated in Fig. 11.

A further modification is indicated in Figs. 8 and 9, where the end of the spring J, instead of being secured rigidly to the gearwheel 0 by the pin J is secured to the dog R, which is itself pivoted between the bifurcated ends of the support R, which is pivoted at R to the projecting end R of the crank D, and is slotted at It, so as to have a motion about the pivot R the journal-trunnion R of the crank D passing through it. In this event the circular ratchet R is placed about the inner portion of the gear-wheel C and in it is adapted to play the dog R. This dog is held outwardly against such ratchet by the spring R It is clear now that the operation is substantially the same as in Fig. 3, except that the pick is taken up at once, and the process of recompressing the spring F immediately follows the delivery of the blow.

In Fig. 8 it is seen that the spring F is being compressed by the rotation of the gear O, since the dog R engages the ratchet R",

and thus by means of the spring J retracts the elastic pitman E. Now since the end of the spring J is secured permanently to the pin J the hook J being bent over about such pin, it is clear that when the parts have reached a certain position the expansion of the spring F will force the pick forward and will carry with it the crank and dog and the spring J as long as the dog moves faster than its ratchet, and as soon as the blow is delivered and the power is taken from the elastic pitman E said dog will immediately re-engage with the ratchet R and carry the spring J around with it until the elastic pitman E is again applied to the work of compressing the spring F and retracting the pick.

T is a block supported over the commutator B and T is a carbon on which lies the plate T which is downwardly forced by the spring-arm T to keepthe carbon against the commutator. This whole device is supported by the arm T Among the important features of my invention are the several elastic connections or cushions between the operative parts of the machine, some or all of which can be used, according to the work required; also, the elastically connected and supported fly-wheel and gear-wheel; also, the flexible elastic or jointed pitman, so that the driving gear-wheel may continue its rotation after the blow is delivered without pushing upon the pick, which might be the case in the event of the use of a rigid pitman; also, the use of a spring J, whereby the connection between the reciprocating portion and the driving rotating portion is made elastic and the operative connection between the two is made intermittent.

It is evident that the parts of my machine could be greatly varied without departing from the spirit of my invention, and it is also clear that the principal features of my invention, as herein set out, are equally applicable to drills for rock and other similar substances, as well as for coal. I have found that in mining-machines and drilling-machines there is peculiar liability to various injuries on account of the rapid rotation of the parts when an electric motor is used, and the great strain upon the parts from such a rapid succession of powerful strokes delivered by a reciprocating bar, and hence the importance of the elasticand flexible connections and cushions which are devised and herein set forth.

It will be noticed in Fig. 3 that the buffer F is incased. This buffer is made of rubber and incased in an oil-proof case, inasmuch as oil destroys the rubber. It will also be noticed in Fig. 2 that the switch B is a doublepole switch, so arranged that the two arms move simultaneously upon the two contacts co-operating therewith. The two contacts are shown above and slightly to the left of the ends of the contacts. This switch in miningmachines is found to have a peculiar advanage from the oil and dirt constantly accumulating upon the machine. It is found in practice that it is best to disconnect both poles at once by means of such a switch as is shown at B, so that the work of repair, 850., can go forward without inconvenience of having the machine continually charged.

The cap B (see Fig. 2) is novel, inasmuch as it bears upon a projection forming an essential part of the field-magnet pole-piece, which is preferably turned concentric with the bore thereof. The projection of this polepiece under the cap B is shown immediately below in the opening back of the handle B. The carbon-brush holder (shown at Fig. 5) is possessed of the novel feature of having a follower T which is connected to the frame T by a flexible wire. (Shown at the left.) This follower is pressed upon by the roller at the end of the arm T The oflice of the flexible Wire connecting the frame T to the follower T is to avoid running the current to the spring which forces down the arm T thereby drawing the temper from the spring.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In a drill, the combination of a drivingmotor with a driving-wheel operated thereby, a device to throw the drill-bar, a catch connected therewith, and a co-operating retracting device elastically mounted upon the driving-wheel.

2. The combination of a driving-motor with a device for throwing the dri1l-bar, and a spring and a pitman, one end of said spring adapted to be intermittently secured to the motor and the other secured to the pitman.

3. In a drill, the combination of a drivingmotor with a driving-wheel operated thereby, a device to throw the drill-bar, a pitman connected therewith, and a crank elastically secured to the driving-wheel.

4.. In a drill, the combination of a drivingmotor with a driving-wheel operated thereby, a device to throw the drill-bar, a pitman connected therewith, and a crank adapted to be intermittently elastically secured to the driving-wheel.

5. The combination of a driving-motor with a device to throw the drill-bar, and a connection between the two, consisting of a spring adapted to operatively connect them when the pitman tends to move slower than the opposed part of the motor and disconnect them when the pitman tends to move faster.

6. In a mining-machine, the combination of a device for-drivin g the drill-bar with a motor and a flexible pitman clamped rigidly to the cross-head connecting the motor and driving device.

7. In a mining-machine, the combination of a driving device for the drill-bar withamotor and a flexible pitman between them, the pitman connected to an electric motor by means of an elastic driving medium.

8. In a mining-machine, the combination of a driving device for the drill-bar with a motor and a pitman to connect the motor and device, said pitman intermittently, elastically, and operatively connected with the motor.

9. In a mining-machine, the combination of a pitman with a driving-wheel of the motor, said pitman adapted to be engaged by one end of a spring, the other end of which is rigidly secured to the driving-wheel of the motor.

10. In a mining-machine, the combination of a pitman with the driving-wheel of the motor, said pitman secured to one end of a spring, the other end of which is intermittently operatively secured to the driving-wheel.

11. In a mining-machine, the combination of a pitman with the driving-wheel of the motor, a spring and two arms pivoted upon each other upon the driving-wheel and connected, respectively, with the ends of the spring, said pitman also connected to one of these arms, a ratchet on the driving-wheel, and a dog on the other arm adapted to engage the ratchet.

12. In a mining-machine, a bufier consisting of an elastic body surrounded by a cover which is substantially oil-proof.

ELMER A. SPERRY.

Witnesses:

FRANCIS W. PARKER, DAVIDA J. J OHNSON. 

